1. Mechanics
Force

2. The forces on you
Stand up and feel the forces on your feet. What forces are on you?
Lift one foot off the floor. What happens to the forces?
Push down on a table while standing up. What happens to the forces?

3. Using scales to measure weight
Stand with one foot in contact with the floor and one foot on scales. What is your maximum / minimum ‘weight’ on the scales?
Stand with both feet on the scales and push down on a table. What is your maximum / minimum ‘weight’ on the scales?

4. Thought experiments
What would happen if you stood on scales in a lift?
What is the maximum force you can pull down on a nail stuck in the ceiling? How can you make this more than your own weight?